The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 2021
Filed:
Mar. 29, 2017
Applicant:
Nof Corporation, Tokyo, JP;
Inventors:
Takuma Tsubusaki, Kawasaki, JP;
Mika Shishido, Kawasaki, JP;
Assignee:
NOF CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08J 3/075 (2006.01); C08L 71/02 (2006.01); C08L 77/04 (2006.01); A61K 47/22 (2006.01); C08K 5/00 (2006.01); A61K 47/34 (2017.01); C08G 65/333 (2006.01); C08K 11/00 (2006.01);
U.S. Cl.
CPC ...
C08J 3/075 (2013.01); A61K 47/22 (2013.01); A61K 47/34 (2013.01); C08G 65/333 (2013.01); C08K 5/00 (2013.01); C08K 11/00 (2013.01); C08L 71/02 (2013.01); C08L 77/04 (2013.01); C08J 2371/02 (2013.01); C08L 2201/06 (2013.01); C08L 2312/00 (2013.01);
Abstract
A biodegradable hydrogel having an acetal structure whose hydrolysis rate under different pH environments in the living body can be accurately controlled. The hydrogel is obtained by crosslinking a polyalkylene glycol derivative having a cyclic benzylidene acetal structure represented by formula (1) shown below with a crosslinking agent: where Rand R; R, R, Rand R; s; t; s+t; P; Zand Z; Wand Xare as defined herein.